<!doctype html>
<meta name="timeout" content="long">
<link rel="author" title="Aditya Keerthi" href="https://github.com/pxlcoder">
<link rel="help" href="https://html.spec.whatwg.org/#the-select-element">
<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
<title>Test &lt;select&gt; multiple attribute options visual order</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>

<select multiple size="4"></select>
<script>
const select = document.querySelector("select");
for (let i = 0; i < 4; i++) {
    const option = document.createElement("option");
    option.textContent = `Option ${i + 1}`;
    select.appendChild(option);
}

for (const writingMode of ["horizontal-tb", "vertical-lr", "vertical-rl", "sideways-lr", "sideways-rl"]) {
    if (!CSS.supports(`writing-mode: ${writingMode}`))
        continue;

    const isHorizontal = writingMode === "horizontal-tb";
    const isReversedBlockFlowDirection = writingMode.endsWith("-rl");

    promise_test(async function() {
        select.style.writingMode = writingMode;
        this.add_cleanup(() => {
            select.removeAttribute("style");
            select.value = "";
        });

        const elementBox = select.getBoundingClientRect();
        const computedStyle = getComputedStyle(select);

        const borderAndPaddingTop = parseFloat(computedStyle.borderTopWidth) + parseFloat(computedStyle.paddingTop);
        const borderAndPaddingRight = parseFloat(computedStyle.borderRightWidth) + parseFloat(computedStyle.paddingRight);
        const borderAndPaddingBottom = parseFloat(computedStyle.borderBottomWidth) + parseFloat(computedStyle.paddingBottom);
        const borderAndPaddingLeft = parseFloat(computedStyle.borderLeftWidth) + parseFloat(computedStyle.paddingLeft);

        const contentX = elementBox.x + borderAndPaddingLeft;
        const contentY = elementBox.y + borderAndPaddingTop;
        const contentWidth = elementBox.width - borderAndPaddingLeft - borderAndPaddingRight;
        const contentHeight = elementBox.height - borderAndPaddingTop - borderAndPaddingBottom;

        const logicalOptionHeight = (isHorizontal ? contentHeight : contentWidth) / select.size;

        let currentX = contentX + (isHorizontal ? contentWidth : logicalOptionHeight) / 2;
        let currentY = contentY + (isHorizontal ? logicalOptionHeight : contentHeight) / 2;

        for (let i = 0; i < select.size; i++) {
            await new test_driver.Actions()
                .pointerMove(Math.round(currentX), Math.round(currentY))
                .pointerDown()
                .pointerUp()
                .send();

            assert_equals(
                select.value,
                select.options[isReversedBlockFlowDirection ? (select.size - i - 1) : i].value,
                "options are in visually incorrect order"
            );

            if (isHorizontal) {
                currentY += logicalOptionHeight;
            } else {
                currentX += logicalOptionHeight;
            }
        }
    }, `select[multiple][style="writing-mode: ${writingMode}"] has visually correct option order`);
};
</script>
